Sakol sustaining a gunshot to the chest and was pronounced dead at Yarang Hospital.
His elder brother, also a schoolteacher, was shot dead two years ago and Sakol was hired to replace him.
Police suspect that insurgents killed Sakol with the goal of creating unrest.
Yesterday at about 8am, a roadside bomb went off in Muang district and slightly wounded two soldiers while another roadside bomb in Yarang district exploded about the same time and slightly wounded two defence volunteers.